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      基于Redis的访问次数限制
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    <h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><p>某些时候,总有些艺高人胆大的家伙喜欢乱来,所以基于Redis写了一个限制访问次数的功能.</p>
<p>需要用到AOP实现(本文使用),当然,也可以使用拦截器实现,看个人喜好吧.</p>
<h2 id="实现"><a href="#实现" class="headerlink" title="实现"></a>实现</h2><h3 id="导入依赖"><a href="#导入依赖" class="headerlink" title="导入依赖"></a>导入依赖</h3><pre class="line-numbers language-xml" data-language="xml"><code class="language-xml"><span class="token comment">&lt;!-- AOP依赖 --></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.springframework.boot<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>spring-boot-starter-aop<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>version</span><span class="token punctuation">></span></span>2.1.5.RELEASE<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>version</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="自定义注解"><a href="#自定义注解" class="headerlink" title="自定义注解"></a>自定义注解</h3><p>创建一个自定义注解来标记需要限制访问的接口,当然你需要限制全部当我没说..</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
 * @author GAS
 */</span>
<span class="token annotation punctuation">@Retention</span><span class="token punctuation">(</span><span class="token class-name">RetentionPolicy</span><span class="token punctuation">.</span>RUNTIME<span class="token punctuation">)</span>
<span class="token annotation punctuation">@Target</span><span class="token punctuation">(</span><span class="token class-name">ElementType</span><span class="token punctuation">.</span>METHOD<span class="token punctuation">)</span>
<span class="token keyword">public</span> <span class="token annotation punctuation">@interface</span> <span class="token class-name">AccessLimit</span> <span class="token punctuation">&#123;</span>
    <span class="token comment">//每秒</span>
    <span class="token keyword">int</span> <span class="token function">seconds</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//最大访问次数</span>
    <span class="token keyword">int</span> <span class="token function">maxcount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//是否判断登录</span>
    <span class="token keyword">boolean</span> <span class="token function">needLogin</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">default</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="自定义AOP"><a href="#自定义AOP" class="headerlink" title="自定义AOP"></a>自定义AOP</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
 * @author LZC
 * @Date: 2020/11/1 0:12
 * @Description: 接口防刷拦截器
 */</span>
<span class="token annotation punctuation">@Aspect</span>
<span class="token annotation punctuation">@Component</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">LimitVisitAspect</span> <span class="token punctuation">&#123;</span>

    <span class="token annotation punctuation">@Autowired</span>
    <span class="token keyword">private</span> <span class="token class-name">RedisUtil</span> redisUtil<span class="token punctuation">;</span>

    <span class="token annotation punctuation">@Pointcut</span><span class="token punctuation">(</span><span class="token string">"@annotation(accessLimit)"</span><span class="token punctuation">)</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">excudeService</span><span class="token punctuation">(</span><span class="token class-name">AccessLimit</span> accessLimit<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token annotation punctuation">@Around</span><span class="token punctuation">(</span><span class="token string">"excudeService(accessLimit)"</span><span class="token punctuation">)</span>
    <span class="token keyword">public</span> <span class="token class-name">Object</span> <span class="token function">doAround</span><span class="token punctuation">(</span><span class="token class-name">ProceedingJoinPoint</span> pjp<span class="token punctuation">,</span> <span class="token class-name">AccessLimit</span> accessLimit<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Throwable</span> <span class="token punctuation">&#123;</span>

        <span class="token comment">// 获得request对象</span>
        <span class="token class-name">RequestAttributes</span> ra <span class="token operator">=</span> <span class="token class-name">RequestContextHolder</span><span class="token punctuation">.</span><span class="token function">getRequestAttributes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">ServletRequestAttributes</span> sra <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">ServletRequestAttributes</span><span class="token punctuation">)</span> ra<span class="token punctuation">;</span>
        <span class="token class-name">HttpServletRequest</span> request <span class="token operator">=</span> sra<span class="token punctuation">.</span><span class="token function">getRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">String</span> uri <span class="token operator">=</span> request<span class="token punctuation">.</span><span class="token function">getRequestURI</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">String</span> ip <span class="token operator">=</span> request<span class="token punctuation">.</span><span class="token function">getRemoteAddr</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">String</span> key <span class="token operator">=</span> <span class="token string">"limit:"</span> <span class="token operator">+</span> ip <span class="token operator">+</span> <span class="token string">"-"</span> <span class="token operator">+</span> uri<span class="token punctuation">;</span>

        <span class="token class-name">String</span> s <span class="token operator">=</span> redisUtil<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//我这里因为项目需求 简单粗暴 单日只能访问一次</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>s <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
            <span class="token comment">// result的值就是被拦截方法的返回值</span>
            <span class="token class-name">Object</span> result <span class="token operator">=</span> pjp<span class="token punctuation">.</span><span class="token function">proceed</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            redisUtil<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span><span class="token string">"1"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">return</span> result<span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>

        <span class="token keyword">return</span> <span class="token class-name">AjaxResult</span><span class="token punctuation">.</span><span class="token function">success</span><span class="token punctuation">(</span><span class="token string">"访问过多了"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token comment">/**
     * 判断IP地址是否为内外IP
     * 没用到
     * @param addr
     * @return
     */</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">boolean</span> <span class="token function">internalIp</span><span class="token punctuation">(</span><span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> addr<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token comment">//使用方式</span>
        <span class="token comment">//if (ip.equals("0:0:0:0:0:0:0:1") || ip.equals("127.0.0.1")) &#123;</span>
        <span class="token comment">//    return true;</span>
        <span class="token comment">//&#125;</span>
        <span class="token comment">//byte[] addr = IPAddressUtil.textToNumericFormatV4(ip);</span>
        <span class="token keyword">final</span> <span class="token keyword">byte</span> b0 <span class="token operator">=</span> addr<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
        <span class="token keyword">final</span> <span class="token keyword">byte</span> b1 <span class="token operator">=</span> addr<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
        <span class="token comment">//10.x.x.x/8</span>
        <span class="token keyword">final</span> <span class="token keyword">byte</span> SECTION_1 <span class="token operator">=</span> <span class="token number">0x0A</span><span class="token punctuation">;</span>
        <span class="token comment">//172.16.x.x/12</span>
        <span class="token keyword">final</span> <span class="token keyword">byte</span> SECTION_2 <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">byte</span><span class="token punctuation">)</span> <span class="token number">0xAC</span><span class="token punctuation">;</span>
        <span class="token keyword">final</span> <span class="token keyword">byte</span> SECTION_3 <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">byte</span><span class="token punctuation">)</span> <span class="token number">0x10</span><span class="token punctuation">;</span>
        <span class="token keyword">final</span> <span class="token keyword">byte</span> SECTION_4 <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">byte</span><span class="token punctuation">)</span> <span class="token number">0x1F</span><span class="token punctuation">;</span>
        <span class="token comment">//192.168.x.x/16</span>
        <span class="token keyword">final</span> <span class="token keyword">byte</span> SECTION_5 <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">byte</span><span class="token punctuation">)</span> <span class="token number">0xC0</span><span class="token punctuation">;</span>
        <span class="token keyword">final</span> <span class="token keyword">byte</span> SECTION_6 <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">byte</span><span class="token punctuation">)</span> <span class="token number">0xA8</span><span class="token punctuation">;</span>
        <span class="token keyword">switch</span> <span class="token punctuation">(</span>b0<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            <span class="token keyword">case</span> SECTION_1<span class="token operator">:</span>
                <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
            <span class="token keyword">case</span> SECTION_2<span class="token operator">:</span>
                <span class="token keyword">if</span> <span class="token punctuation">(</span>b1 <span class="token operator">>=</span> SECTION_3 <span class="token operator">&amp;&amp;</span> b1 <span class="token operator">&lt;=</span> SECTION_4<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
                    <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
                <span class="token punctuation">&#125;</span>
            <span class="token keyword">case</span> SECTION_5<span class="token operator">:</span>
                <span class="token keyword">switch</span> <span class="token punctuation">(</span>b1<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
                    <span class="token keyword">case</span> SECTION_6<span class="token operator">:</span>
                        <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
                <span class="token punctuation">&#125;</span>
            <span class="token keyword">default</span><span class="token operator">:</span>
                <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<ul>
<li>获取到<code>IP</code>和<code>访问URL</code>将其作为一个key,存放在Redis中,并记录访问次数,如果超过返回错误或者其他消息</li>
</ul>
<h3 id="定时删除限制"><a href="#定时删除限制" class="headerlink" title="定时删除限制"></a>定时删除限制</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
 * 每天清除redis的限制访问列表
 * 当然 也可以给redis设置过期时间
 * 但是我就是要这样写
 *
 * @author GAS
 * @date 2021年08月30日 16:42
 */</span>
<span class="token annotation punctuation">@Component</span>
<span class="token annotation punctuation">@EnableScheduling</span>
<span class="token annotation punctuation">@EnableAsync</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">CleanLimitTask</span> <span class="token punctuation">&#123;</span>
    <span class="token annotation punctuation">@Autowired</span>
    <span class="token keyword">private</span> <span class="token class-name">RedisUtil</span> redisUtil<span class="token punctuation">;</span>

    <span class="token annotation punctuation">@Async</span>
    <span class="token annotation punctuation">@Scheduled</span><span class="token punctuation">(</span>cron <span class="token operator">=</span> <span class="token string">"0 0 23 * * ?"</span><span class="token punctuation">)</span><span class="token comment">//每天23点执行</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">cleanLimit</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token class-name">Set</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">></span></span> keys <span class="token operator">=</span> redisUtil<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span><span class="token string">"limit:*"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        redisUtil<span class="token punctuation">.</span><span class="token function">delete</span><span class="token punctuation">(</span>keys<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>最后在你需要限制的地方加上注解就行了</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Controller</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> testController<span class="token punctuation">&#123;</span>
    <span class="token annotation punctuation">@RequestMapping</span><span class="token punctuation">(</span><span class="token string">"/hello"</span><span class="token punctuation">)</span>
    <span class="token annotation punctuation">@AccessLimit</span><span class="token punctuation">(</span>seconds <span class="token operator">=</span> <span class="token number">5</span><span class="token punctuation">,</span> maxcount <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">)</span>
    <span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">test</span><span class="token punctuation">(</span><span class="token class-name">HttpServletRequest</span> request<span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> <span class="token string">"hello"</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h2><p>文章1: <a target="_blank" rel="noopener" href="https://www.csdn.net/tags/MtjaEg0sNzYyMzQtYmxvZwO0O0OO0O0O.html">springboot限制接口访问次数 - CSDN</a></p>
<p>文章2: <a target="_blank" rel="noopener" href="https://blog.csdn.net/It_BeeCoder/article/details/94303699">SpringBoot实现限制ip访问次数_It_BeeCoder的博客-CSDN博客_springboot 限制访问频率</a></p>
<p>文章3: <a target="_blank" rel="noopener" href="https://blog.csdn.net/qq_37342720/article/details/113836454">springboot接口限制访问次数_战战的坚果的博客-CSDN博客</a></p>
<p>文章4: <a target="_blank" rel="noopener" href="https://blog.csdn.net/qq_41084438/article/details/109014344">SpringBoot在一定时间内限制接口请求次数_qq_41084438的博客-CSDN博客_springboot限制接口访问次数</a></p>

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